Add F4E2M1FN type: HLO evaluator

Author: sergey-kozub

xla/hlo/evaluator/BUILD

@@ -36,6 +36,7 @@ cc_library(
         "hlo_evaluator_typed_visitor_int4.cc",
         "hlo_evaluator_typed_visitor_int64.cc",
         "hlo_evaluator_typed_visitor_int8.cc",
+        "hlo_evaluator_typed_visitor_mxfloat.cc",
         "hlo_evaluator_typed_visitor_uint16.cc",
         "hlo_evaluator_typed_visitor_uint32.cc",
         "hlo_evaluator_typed_visitor_uint64.cc",

xla/hlo/evaluator/hlo_evaluator_typed_visitor.h

@@ -1734,6 +1734,7 @@ extern template class HloEvaluatorTypedVisitor<double>;
 extern template class HloEvaluatorTypedVisitor<complex64>;
 extern template class HloEvaluatorTypedVisitor<complex128>;
 extern template class HloEvaluatorTypedVisitor<bfloat16, float>;
+extern template class HloEvaluatorTypedVisitor<tsl::float4_e2m1fn, float>;
 extern template class HloEvaluatorTypedVisitor<tsl::float8_e5m2, float>;
 extern template class HloEvaluatorTypedVisitor<tsl::float8_e4m3, float>;
 extern template class HloEvaluatorTypedVisitor<tsl::float8_e4m3fn, float>;

xla/hlo/evaluator/hlo_evaluator_typed_visitor_mxfloat.cc

@@ -0,0 +1,22 @@
+/* Copyright 2024 The OpenXLA Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+==============================================================================*/
+
+#include "xla/hlo/evaluator/hlo_evaluator.h"
+#include "xla/hlo/evaluator/hlo_evaluator_typed_visitor.h"
+#include "tsl/platform/ml_dtypes.h"
+
+namespace xla {
+template class HloEvaluatorTypedVisitor<tsl::float4_e2m1fn, float>;
+}  // namespace xla